Question regarding quality Backlinking!

So I have a blog in the Business Niche and it's divided in 5 different sub-niches. I'm looking to get more quality backlinks. Right now I'm using twitter but I was also thinking of writing either for Ezinarticles or Hubpages. Which website would be more beneficial for me???

Like politico said, do a search for lists of web 2.0 properties and wiki properties and document sharing properties, use as many as possible and think about creating a pdf doc with html links inside of it, then share it on the doc sharing sites.....and look into blog commenting maybe also.

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